Mine used to hang up after a full throttle run, and would lope at a stoplight b/c the pressures were spiking from 4.3Kpsi to about 7. Ended up being a FCA. Check that with a known good one first (I think it's a T25 three bolt pattern).

Its normanl. My has always done it. Try to let off the throttle gradually and it will not spike so much. Think about what is happening . When you are on the throttle fuel is flowing at a required rate. Once you close the throttle the fuel is still in the line and flowing for a few seconds before the fuel is shut off or decreased to a lessor flow. That is where the spike comes from. That's the way it was explained to me. Hope this helps.

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